Furnace wall



March 6, 1934. T, c TQQMEY 1,949,638

FURNACE WALL Filed Oct. 1, 1929 3 Sheets-Sheet l INVENTOR FIG. I W

ATTORNEW March 6, 1934. T. c TOQMEY 1,949,638

FURNACE WALL Filed Oct. 1929 3 Sheets-Sheet 2 Ji 6 1- INVENTOR FIG. 2 BYW :T%W

March 1934- T. c. TOOMEY 49, 38

' FURNACE WALL Filed Oct. 1, 1929 3 $heets-Sheet 3 u I? a y INVENTORPatented Mar. 6, 1934 UNITED STATES PATENT OFFICE FURNACE WALL porationof Delaware Application October 1,

3 Claims.

This invention relates to a furnace wall that has water tubes thereinand is supported at the bottom. A boiler is located above the furnacewall and a slip joint is provided between the upper edge of the furnacewall and the boiler proper.

The invention will be understood from the description in connection withthe accompanying drawings, in which Fig. 1 is a vertical section throughan illustrative embodiment of the invention; Fig. 2 is a similar sectionat right angles to Fig. 1; Figs. 3, 4 and 5 are vertical sections on anenlarged scale, partly broken away, showing some of the details.

In the drawings, reference character 1 indicates a furnace above which aboiler'of the Babcock & Wilcox type, for example, may be located. Asillustrated, this boiler comprises the usual steam and water drum 2,bank of inclined tubes 3 and superheater 4.

A-row of upwardly extending tubes 5 is provided along the front wall ofthe furnace, the upper ends of these tubes being bent outwardly andextending into the upper header 6, while the lower ends of the tubes 5extend straight downwardly and enter the lower header 7 that lies in theplane of this wall. One or more return circulation tubes 8 lie outsideof the furnace connecting headers 6 and 7. The lower header 7 issupported upon a fixed support 9 which thereby also supports the frontwall of the furnace.

A row of tubes 10 is provided along the rear wall of the furnace, theupper ends of these tubes extending outwardly and entering the upperheader 11 while the lower ends extend straight downwardly and enter thelower header 12. One or more return circulation tubes 13 located outsideof the furnace connects the headers 11 and 12. The lower header 12 issupported upon fixed support 14 which thereby supports the rear wall ofthe furnace.

A row of upwardly extending tubes 15 is lo!- cated along each side wallof the furnace (Fig. 2), the upper ends of these tubes extendingoutwardly into upper headers 16 and the lower ends extending straightdownwardly into the lower headers 1'7. The headers 1'7 are supportedupon fixed supports 19 which also support the side walls of the furnace.

The floor 20 of the furnace is supported in a fixed position by means ofspaced transverse supports 21 and the edges of the floor contact withthe walls of the furnace so that molten slag can collect in the lowerportion of the furnace and 1929, Serial No. 396,476

expand upwardly. Transverse cross supports 23 are provided along theoutside walls of the furnace and are connected to the tubes 5, 10 and 15by means of tie clamps 24 on these tubes, slotted. holes being providedin these clamps to permit movement of tubes due to expansion andcontraction, while the supports 23 are held in fixed positions.

The wall tubes may be lined with the well known Bailey blocks 25 thatare connected to the tubes to complete the wall structure. Fuel burners26 are indicated along the front wall of the furnace. The wall tubes maybe connected to the circulation system of the boiler, the connectionfrom the upper headers to the steam and water drum being indicated bythe tubes 27, and the connections from the water space of the boiler tothe lower ends of the wall tubes being arranged in any convenient orwell known way.

Sections of brick work or tile 28 and 29 are shown near the upper edgesof the front and rear walls of the furnace above the outwardly extendingportions of the tubes and below the boiler parts.

- The slip joint 30 to take care of expansion and contraction at theupper end of the front wall of the furnace is shown most clearly in Fig.3. The uppermost row of tile 28 is provided with a ledge 31 thatprojects into a corresponding recess 32 in the fixed tile 33, so that asliding joint is provided between the edges of the ledge 31 and recess32. A metal plate 34 is provided along the outer edge of the slip joint30. The tile be tween the metal plate 34 and the inside of the furnaceprotect the plate from the heat of the furnace.

The upper header 11 for the row of tubes at the rear wall of the furnaceis partially supported by means of springs 35 below the header. Theupper portion of the wall extends inwardly to some extent as indicatedat 36. The springs 35 rest upon the support 37 and spring supports 38extend from the support 37 to lugs 39 attached to the inwardly bentportions of the tubes 10 to take a portion of the weight of the rearwall of the furnace.

The slip joint at the upper edges of the side walls of the furnace isshown more clearly in Fig. 5. The fixed transverse I beam support 40supports the metallic wall boxes 41 upon which the wall at the side oftheboiler is supported.

Tile 42 are supported upon the bulb plate 43 which is supported by thewall boxes 40 and plates 44 on the upper row of Bailey blocks 25 extendinto a slot between the edges of the tile 42 and the plate 43 to formthe slip joint. The lower sides 45 of the tile 42 are made sloping sothat ash lib ber walls, means for burning fuel in suspension in saidlower chamber, said lower chamber having a horizontally arranged floorof slag resistant material coacting with said lower chamber verticalwalls to maintain a slag pool in said lower chamber, means forming aslag discharge opening from said lower chamber, each of said lowerchamber walls comprising a row of laterally spaced vertical coolingfluid tubes extending substantially throughout the height of said wallsand connected to a header at their lower endpmeans carried by said tubesfor closing the inter-tube spaces, means for bottom supporting saidlower chamber walls and preventing downward expansion thereof comprisinga metallic supporting structure receiving the headers of said walltubes, and means forming a gas sealing expansion joint between the lowerend of said upper chamber walls and the upper end of corresponding lowerchamber walls.

2. Fuel burning apparatus comprising vertical walls enclosing an upperfluid heating chamber and other vertical fluid cooled walls enclosing alower furnace chamber and substantially in alignment with said upperchamber walls, said lower chamber walls being normally subjected inoperation to high temperatures and arranged for substantial verticalexpansion and contraction movements, means for supportingsaidupperchamber walls independently of said lower chamberwalls, means forburning fuel in suspension in said lower chamber, said lower chamberhaving a horizontally arranged floor of slag-resistant materialcoactingwith said lower chamber vertical walls to maintain a slag pool in saidlower chamber, means forming a slag discharge opening from said lowerchamber, said lower chamber walls comprising a row of laterally spacedvertical cooling fluid tubes extending substantially throughout theheight of said walls and connected to a header at their lower end, meanscarried by said tubes for closing the inter-tube spaces, means forbottom supporting said lower chamber walls and preventing downwardexpansion thereof and comprising a metallic supporting structurereceiving the headers of said wall tubes and fixed lateral wall supportsat the outer side of said lower walls and having a connection to saidwall tubes permitting vertical expansion and contraction of said tubes,and means forming a gas sealing expansion joint between the lower end ofsaid upper chamber walls and the upper end of corresponding lowerchamber walls.

3. Fuel burning apparatus comprising vertical walls enclosing an upperfluid heating chamber and other vertical fluid cooled walls enclosing alower furnace chamber and substantially inalignment with said upperchamber walls, said lower chamber walls being normally subjectedinoperation to high temperatures and arranged for substantial verticalexpansion and contraction movements, means for supporting said upperchamber walls independently of said lower chamber walls, means forburning fuel in suspension in said lower chamber, said lower chamberhaving a horizontally arranged floor of slag resistant material coactingwith said lower chamber vertical walls to maintain a slag pool in saidlower chamber, means forming a slag discharge opening from said lowerchamber, said lower chamber walls comprising a row of laterally spacedverticalcooling fluid tubes extending substantially throughout theheight of said walls and connected to substantially horizontal headersat their upper and lower ends, means carried by said tubes for closingthe inter-tube spaces, each of said upper headers being arranged outsideand each of said lower headers being arranged in the plane of saidtubes, means for bottom supporting said lower chamber walls andpreventing downward expansion thereof comprising a metallic supportingstructure receiving the lower headers of said wall tubes, and meansforming a gas sealing expansion joint between the lower end of saidupper chamber walls and'the upper end of corresponding lower chamberwalls.

THOMAS C. TOOMEY.

